[PATCH v2] ASoC: wm8731: Fix a unused function gcc warning

[zhong jiang]

Fix the following compile warning:

sound/soc/codecs/wm8731.c:575:12: warning: 'wm8731_request_supplies' defined but not used [-Wunused-function]
sound/soc/codecs/wm8731.c:600:12: warning: 'wm8731_hw_init' defined but not used [-Wunused-function]

Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
---
v1->v2:
 -  Move the declaration of wm8731_supply_names into the #if block 
    unused function has been wrapped to decrease the #if block definition. 

 sound/soc/codecs/wm8731.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 7c8fad8..9399103 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -36,12 +36,6 @@
 #include "wm8731.h"
 
 #define WM8731_NUM_SUPPLIES 4
-static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
-	"AVDD",
-	"HPVDD",
-	"DCVDD",
-	"DBVDD",
-};
 
 /* codec private data */
 struct wm8731_priv {
@@ -572,6 +566,14 @@ static int wm8731_startup(struct snd_pcm_substream *substream,
 	.symmetric_rates = 1,
 };
 
+#if defined(CONFIG_I2C) || defined(CONFIG_SPI_MASTER)
+static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
+	"AVDD",
+	"HPVDD",
+	"DCVDD",
+	"DBVDD",
+};
+
 static int wm8731_request_supplies(struct device *dev,
 		struct wm8731_priv *wm8731)
 {
@@ -627,6 +629,7 @@ static int wm8731_hw_init(struct device *dev, struct wm8731_priv *wm8731)
 
 	return ret;
 }
+#endif
 
 static const struct snd_soc_component_driver soc_component_dev_wm8731 = {
 	.set_bias_level		= wm8731_set_bias_level,
-- 
1.7.12.4